The setup supports a few command line switches (which are case sensitive!):

/S for silent installation

/D=C:\Program Files\My Installation Dir
to set the installation path

/jpg=1 /gif=1
to associate jpeg and gif files and /jpg=0 /gif=0 to unassociate them. Use the names found under File - Settings... for the other file types. There is also /all=1 and /all=0 to associate/unassociate all file types

/kill=1
forces the closure of the application before installing it, working for Win2000 or higher (unsaved data are lost)